A recent article in The New York Times asks, “What Was the Greatest Era for Innovation?” It’s a difficult question to answer—if there even is an answer—as everything from plumbing to airplanes, Kellogg’s Corn Flakes and smartphones have shaped the evolution of American life. Instead, The Times surfaces some of the most notable inventions and ground-breaking ideas of the past couple centuries to allow the reader to decide on their own. What could you not live without: your microwave or flushable toilet?